Re-Pack!!!!

Hey, my exhaust cans (TBR C4 Titanium) have not been re-packed and I read that you should do this every 2-3000 miles! There is nothing wrong with them, in fact they are great... well maybe a little quiet for my taste but sound good. My question is has anyone tried playing with exhaust packing, i.e. packing the pipe tight or packing it loose? If it's packed tight, I'm guessing the sound will be louder and the gas flow will exit the cans quicker. If packed loose i'm thinking the sound will have more bass and reduce the gas flow!?!? Basically what wadding should I use and what technique is the way forward for performance? 
